Jeffrey Stolt
Analyst · Barclays
Thanks, Brad. Two Harbors' portfolio delivered another quarter of outstanding returns as you can see from the highlights on Slide 8. As Tom mentioned, our total return for the quarter was 11.5%. This was driven by strong underlying performance, as well as unrealized gains from both Agency and non-Agency of $32 million and $112 million, respectively. Our portfolio grew by over $3 billion as we fully deployed capital from our 2 raises.
We also increased our allocation to non-Agencies due to the compelling values we saw in that sector in the first quarter. The chart on the bottom left shows our portfolio metrics by strategy. Our asset yield for the quarter was 4.9% and our aggregate net interest margin was 3.9%, 10 basis points higher than a quarter ago and slightly above our expectations. This yield in net interest spread combined with our leverage provided an attractive investment ROE for the quarter.
As you can see, our overall funding costs including hedges was consistent with a quarter ago at 1%. Our Agency spread expanded as the cost of hedging declined leading to a 2.8% net interest spread, up from 2.6%. Our non-Agency strategy delivered an annualized yield of 9.7% and a NIM of 7.4%, in line with the prior quarter. We are very pleased with the performance of both sectors of our business this quarter.
On the bottom right of this slide, we've included some metrics to compare to our performance. A simple duration hedged Agency strategy would have had a return of less than 1%, while credit returns would have been closer to 11%. As a reminder, ABX is a proxy for the subprime market, but does not necessarily mirror cash bond performance. From this table, you can see that the simple strategy of 50% Agency and 50% non-Agency subprime would have generated a return of 5.6% for the quarter. While our capital mix is not quite 50/50, we believe that our returns compare quite favorably versus these indices for the quarter.
Please turn to Slide 9. Our portfolio has grown to $7.5 billion in Agency securities including Inverse IOs and $1.9 billion in non-Agencies or about an 80-20 asset split comparable to last quarter. The portfolio composition was relatively consistent in mix and types of securities as well. We continue to emphasize Agency securities with prepayment protection and subprime bonds for our non-Agency portfolio. During the quarter, we added approximately $700 million in subprime bonds, increasing our allocation to 84% of our non-Agency portfolio. These senior and mezzanine bonds were a key driver in our nearly 10% yield on non-Agencies for the past 3 quarters.
On the Agency side, we focused heavily on prepaid protected assets for our capital deployment particularly on high LTV pools. These pools are typically 100% refinanced loans that have come through the HARP program. We believe it is unlikely that these borrowers will refi again anytime soon. While we still highly favor low loan balance, HECM and multifamily pools, all of which we added to in the first quarter. For many of our new purchases, the prices of high LTV pools provided a more compelling value. The appendix includes some additional slides on both our Agency and non-Agency holdings that you may find useful.
As capital allocation is a key component of Two Harbors' strategy, we have charted our historical capital allocation in the upper right-hand corner of the slide. Our goal is to allocate capital to those sectors we believe have the best risk-adjusted returns, and we believe that our agility in adjusting our capital allocation to the best opportunities and keen focus on security selection continue to be a key factor in our performance.
As you can see, our non-Agency capital allocation shifted upward slightly in the first quarter to 48%. This is a direct result of our focus on the non-Agency sector as we were deploying capital from our recent public offerings. Given current valuations and opportunities in the market, you can expect our capital allocation to remain reasonably consistent in the near term.
Turning to Slide 10. We are very pleased with our overall portfolio metrics and risk profile. On the prepayment front for the first quarter, our Agency CPR declined to 5.2% from 5.6% in the fourth quarter. This result is particularly compelling given the generally high prepayments realized in the Agency market this past quarter. While prepayments in 2012 will likely pick up due to both the lower rate environment and from the influence of policy initiatives, we believe that we have selected securities that are unlikely to experience a significant increase in prepayments.
Our aggregate portfolio had a debt-to-equity ratio of 3.7:1 for the first quarter. This is slightly lower than our historical averages due to the timing of the capital deployment of our 2012 stock offering. We estimate our post deployment leverage in the range of 4x to 4.5x. Our capital allocation figures are based on applying leverage in the range of 6x to 7x for Agencies and 1x to 1.5x for non-Agencies which is consistent with our approach since Two Harbors was formed.
We continue to maintain a low level of interest rate exposure in our Agency portfolio. As of quarter end, we estimate a less than 1% impact on our equity for an up 100 basis point move-in rate. This is down from a 2.3% exposure at December 31. Our average pay rate on swaps as of quarter end was down slightly from a quarter ago to 85 basis points.
Given the low rate environment, we increased our protection against higher rates, particularly through the use of longer dated swaptions. More details on our swap and swaptions are included in the appendix. Please note in particular, the swaption months to expiration and the underlying swap tenders as evidence of the protection we carry.
On the financing side, as we have discussed on previous calls, we continue to believe that a laddered approach to financing with a focus on longer dated repos provides stability to our funding. At March 31, the weighted average days to maturity on our RMBS repo borrowings was 80 days. This is a new metric we will be sharing with you on a go forward basis. Additionally, 38% of our non-Agency repos were for terms of over 90 days. More financing details are in the appendix.
I would like to wrap up this morning with some comments on the market. Interest rates remain low, which is favorable for repo funding and hedging costs. The repo market also remains quite liquid for funding our type of assets. It appears that funding rates will remain low for the next few years although that is certainly subject to change. Mortgage spreads have been volatile the past few years, which has led for the ability to deploy capital opportunistically.
Currently, spreads are reasonably attractive from a long-term historic perspective, but not as interesting as has been available at certain times in recent years. More importantly, we believe that as a result of the drain of capital that has occurred from the Agency mortgage space, attractive returns over time will be available for those who have capital to deploy.
On the non-Agency side, the market seems to be in much better technical shape recently given the successful sales and distribution in the Maiden Lane II assets. We also know however, that distressed markets can be fickle and subject to rapid change. Further, there is certainly the possibility of more distressed sales occurring, but it does seem today that there is a better balance of buyers and sellers.
For instance, while it is unclear how Maiden Lane III will play out, there is certainly a great deal of focus by the buy side and dealer community on that process. More importantly than the technicals, the fundamental backdrop has been improving. The housing market seems to be stabilizing somewhat especially in the $50,000 to $200,000 price range. New delinquencies have continued to decline. Employment continues to grow, albeit slowly and home affordability, as Tom mentioned, is very high. Further, both servicer and policy actions are aiming to help borrowers through various means. We believe that this landscape bodes well for assets with exposure to this sector of the housing market, particularly distressed subprime RMBS. Strategically, we aim to take advantage of the price volatility that can occur in these markets and our approach is to purchase assets that we believe will perform well over time.
To conclude, we are pleased with our performance, our current capital allocation and overall portfolio positioning, and we will continue to be opportunistic in the market to find the best investments to generate value and returns for our stockholders.
I will now turn the call back over to the operator.